Google Maps地理编码API部分邮政编码缺失county数据咨询

我发现部分邮政编码在调用Google Maps地理编码API时无法返回县（county）数据。例如邮政编码30601（佐治亚州雅典市，所属县为Clarke）的返回结果中，本应作为administrative_area_level_2类型返回的县数据缺失，API请求示例及返回结果如下：

$url https://maps.googleapis.com/maps/api/geocode/json?address=30601&key=topsecretkey 

Array
(
    [results] => Array
        (
            [0] => Array
                (
                    [address_components] => Array
                        (
                            [0] => Array
                                (
                                    [long_name] => 30601
                                    [short_name] => 30601
                                    [types] => Array
                                        (
                                            [0] => postal_code
                                        )

                                )

                            [1] => Array
                                (
                                    [long_name] => Athens
                                    [short_name] => Athens
                                    [types] => Array
                                        (
                                            [0] => locality
                                            [1] => political
                                        )

                                )

                            [2] => Array
                                (
                                    [long_name] => Georgia
                                    [short_name] => GA
                                    [types] => Array
                                        (
                                            [0] => administrative_area_level_1
                                            [1] => political
                                        )

                                )

                            [3] => Array
                                (
                                    [long_name] => United States
                                    [short_name] => US
                                    [types] => Array
                                        (
                                            [0] => country
                                            [1] => political
                                        )

                                )

                        )

                    [formatted_address] => Athens, GA 30601, USA
                    [geometry] => Array
                        (
                            [bounds] => Array
                                (
                                    [northeast] => Array
                                        (
                                            [lat] => 34.0593981
                                            [lng] => -83.288826
                                        )

                                    [southwest] => Array
                                        (
                                            [lat] => 33.9479501
                                            [lng] => -83.405851
                                        )

                                )

                            [location] => Array
                                (
                                    [lat] => 34.006845
                                    [lng] => -83.3468784
                                )

                            [location_type] => APPROXIMATE
                            [viewport] => Array
                                (
                                    [northeast] => Array
                                        (
                                            [lat] => 34.0593981
                                            [lng] => -83.288826
                                        )

                                    [southwest] => Array
                                        (
                                            [lat] => 33.9479501
                                            [lng] => -83.405851
                                        )

                                )

                        )

                    [place_id] => ChIJocit0GgT9ogRTBKlRatQYFc
                    [types] => Array
                        (
                            [0] => postal_code
                        )

                )

        )

    [status] => OK
)

而调用邮政编码30083（佐治亚州斯通山，所属县为DeKalb）时，能正常返回包含administrative_area_level_2类型的县数据，返回结果如下：

Array
(
    [results] => Array
        (
            [0] => Array
                (
                    [address_components] => Array
                        (
                            [0] => Array
                                (
                                    [long_name] => 30083
                                    [short_name] => 30083
                                    [types] => Array
                                        (
                                            [0] => postal_code
                                        )

                                )

                            [1] => Array
                                (
                                    [long_name] => Stone Mountain
                                    [short_name] => Stone Mountain
                                    [types] => Array
                                        (
                                            [0] => locality
                                            [1] => political
                                        )

                                )

                            [2] => Array
                                (
                                    [long_name] => DeKalb County
                                    [short_name] => Dekalb County
                                    [types] => Array
                                        (
                                            [0] => administrative_area_level_2
                                            [1] => political
                                        )

                                )

                            [3] => Array
                                (
                                    [long_name] => Georgia
                                    [short_name] => GA
                                    [types] => Array
                                        (
                                            [0] => administrative_area_level_1
                                            [1] => political
                                        )

                                )

                            [4] => Array
                                (
                                    [long_name] => United States
                                    [short_name] => US
                                    [types] => Array
                                        (
                                            [0] => country
                                            [1] => political
                                        )

                                )

                        )

                    [formatted_address] => Stone Mountain, GA 30083, USA
                    [geometry] => Array
                        (
                            [bounds] => Array
                                (
                                    [northeast] => Array
                                        (
                                            [lat] => 33.8351599
                                            [lng] => -84.1243101
                                        )

                                    [southwest] => Array
                                        (
                                            [lat] => 33.7368448
                                            [lng] => -84.246361
                                        )

                                )

                            [location] => Array
                                (
                                    [lat] => 33.7994803
                                    [lng] => -84.1909841
                                )

                            [location_type] => APPROXIMATE
                            [viewport] => Array
                                (
                                    [northeast] => Array
                                        (
                                            [lat] => 33.8351599
                                            [lng] => -84.1243101
                                        )

                                    [southwest] => Array
                                        (
                                            [lat] => 33.7368448
                                            [lng] => -84.246361
                                        )

                                )

                        )

                    [place_id] => ChIJcxoG6teo9YgRwtQgWre-Trk
                    [postcode_localities] => Array
                        (
                            [0] => Pine Lake
                            [1] => Stone Mountain
                            [2] => Tucker
                            [3] => Wilshire
                        )

                    [types] => Array
                        (
                            [0] => postal_code
                        )

                )

        )

    [status] => OK
)

请问：

1. 我是否存在操作失误？
2. 若操作无误，该如何通知谷歌补充此缺失的地理数据？

内容的提问来源于stack exchange，提问作者a coder